This kit can be used for electronic technology foundation and skill teaching and training, electronic skill teaching, electronic process teaching, digital circuit teaching, electronic enthusiasts, beginners training use. Product Name:TypeC SMD soldering practice circuits PCB Material:Double-sided FR-4 1.6MM Working Voltage:DC 5V Welding instructions: 1. LEDs and chips have directions. LED identifies cathode, chip identifies pin 2. Capacitors, resistors, fuses, switches have no direction, pay attention to distinguish parameters, don't make mistakes 3. TYPE-C port welding is difficult, you can use pin header power supply 5V to test other circuits first 4. The holes on both sides are for later expansion of LED dot matrix modules 5. If you burn the code yourself, you can use C interface or serial port, pay attention to the operating procedures Attentions: (except those specially marked) are loose parts, and the need to solder, assemble and debug by. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. The color of accessories is random, and the specification is not accepted. It's DIY kits, needs to finish by yourself. Color:As Shown Material:PCB Package Contents: 1 * LQFP64 Soldering Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.